Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cao hoa » cao hoat, cao khoa, cau hoa
hiem he » hiem xe, thien he, hiem cho
cua tre » cua te, cuu tre, dua tren
hieu he » hieu ve, hieu le, hieu hien
ca dan » cac dan, ca dao
dan vi » doan vi, don vi, dan va
tu sai » tu bai, tu san, tu cai
nam tu » nam thu, nam thuc
sai ky » sac ky
tu ca » tu cac, tu cua, tu can

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky nang cao hoa. ((hiem he) or (hieu he)) nam tu ca dan vi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang cao hoa. ((hiem he) OR (hieu he)) nam tu ca dan vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky nang cao hoa. ((hiem he) or (hieu he)) nam tu ca dan vi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang cao hoa. ((hiem he) or (hieu he)) nam tu ca dan vi ((cua tre) OR (cua triet))*.